Not recommended in concomitant use w/ a levonorgestrel-containing emergency contraceptive. Not recommended in women w/ severe asthma insufficiently controlled by oral glucocorticoid. Not a replacement for regular contraceptive method. Repeated administration w/in the same menstrual cycle is not advisable; subsequent acts of intercourse after using Ella should be protected by a reliable barrier method until the next menstrual period starts. Does not prevent pregnancy in every case; exclude pregnancy by a pregnancy test in case of doubt, >7 days delay in next menstrual period, abnormal bleeding at the expected menses date, or pregnancy symptoms. Consider possible ectopic pregnancy if pregnancy still occurs after treatment. Menstrual periods may occur earlier or later than expected by a few days after intake. Not recommended in severe hepatic impairment. Not recommended in concomitant use w/ CYP3A4 inducers (eg, rifampicin, phenytoin, phenobarb, carbamazepine, efavirenz, fosphenytoin, nevirapine, oxcarbazepine, primidone, rifabutine, St. John's wort); ritonavir (long-term use). Galactose intolerance, Lapp lactase deficiency or glucose-galactose malabsorption. May impair ability to drive or use machines. Not recommended during lactation for 1 wk.